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53 results on '"In situ sampling"'

51. Development of an apparatus to measure groundwater qualities in situand to sample groundwater using boreholes

Author

Ishii, T., Horie, Y., Shimada, J., and Ii, H.

Subjects
GROUNDWATER, SAMPLING (Process)
Abstract

To accurately measure the pH, Eh, EC and temperature of groundwater retrieved from boreholes, a deep groundwater sampling apparatus was developed which provided sensory measurements both in situ and in a flow-through cell at ground level. Under a pressure of 1 x 106 Pa the in situ accuracy of the apparatus sensor was within the following limits: pH q 0.2, temperature q 1 deg.C, Eh q 10 mV, and EC q 2.4%. The measuring and sampling of deep groundwater from a borehole of more than 1000 m in depth was performed continuously for 30 days. Values of pH were the same for the in situ sensor, the flow-through cell sensor and the laboratory measurements of the sampled water. At the beginning of the sampling period, Eh values of the in situ sensor indicated deep groundwater conditions. The apparatus is particularly useful for Eh measurement. Chemical composition and stable isotope ratios indicated that the groundwater sampled from more than 1000 m depth was a connate water with a chemical composition slightly differentfrom seawater of the present time, and the groundwater retrieved from 800 m depth was a meteoric water. Natural radioactive elements are thought to be the origin of the tritium in the groundwater retrieved from the 1000 m depth. [ABSTRACT FROM AUTHOR]

Published
1997

52. An in-situ Sampling Thermal Probe

Author

NEBRASKA UNIV LINCOLN, Hansen,B. L., Kersten,L., NEBRASKA UNIV LINCOLN, Hansen,B. L., and Kersten,L.

Abstract

Philberth's thermal probe concept and Aamot's pendulum steering technique have been incorporated in a new design which passes a portion of the meltwater formed at the tip of the probe through its interior where various parameters such as conductivity can be continuously monitored in high pressure cells. The telemetry system and probe design will permit the addition of other in-situ measurements. A simple DC measurement system provides precision measurement of the ice temperature and changes in the inclination of the probe during freeze-in periods at selected depths in the ice sheet., This article is from 'Proceedings of the International Workshop/Symposium on Ice Drilling Technology (2nd) Held at Calgary, Alberta, Canada on 30-31 August 1982,' AD-A156 733, p119-122.

Published
1984

53. Mechanical characterization of historical masonry by core drilling and testing of cylindrical samples

Author

Andrea Benedetti, Pere Roca, Luca Pelà, Universitat Politècnica de Catalunya. Departament d'Enginyeria Civil i Ambiental, Universitat Politècnica de Catalunya. ATEM - Anàlisi i Tecnologia d'Estructures i Materials, Pela', Luca, Roca, Pere, and Benedetti, Andrea

Subjects
Visual Arts and Performing Arts, Architecture2300 Environmental Science (all), friction, compression test, Enginyeria civil::Materials i estructures [Àrees temàtiques de la UPC], Conservation, Mohr–Coulomb theory, engineering.material, shear, minor destructive testing (MDT), Historical structure, Estructures de murs, Architecture, in-situ sampling, Geotechnical engineering, Lime mortar, Brazilian test, Mohr-Coulomb theory, business.industry, Drilling, Structural engineering, Masonry--Maintenance and repair, Masonry, Coring, lime mortar, masonry, Clay brick, engineering, in situ sampling, Mortar, business, coring, Geology
Abstract

This is an Accepted Manuscript of an article published by Taylor & Francis Group in International Journal of Architectural Heritage: Conservation, Analysis, and Restoration on 2016, available online at: http://www.tandfonline.com/10.1080/15583058.2015.1077906 This paper presents an experimental study aimed at the characterization of the mechanical behaviour of existing masonry. The research proposes a methodology based on the in-situ core drilling of existing masonry members, made of clay brick and low-strength lime mortar. The obtained cylindrical samples, with different diameters, are tested in the laboratory to derive the compression and frictional response of the composite material and the components (units, mortar). The paper addresses the main issues related to the extraction of cylindrical specimens, the testing and the interpretation of results. The proposed minor destructive technique is suitable for existing masonry structures and especially for those of the built cultural heritage, since a direct estimation of the mechanical parameters can be obtained without damaging excessively the historical structure.

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